Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...653..788b&link_type=abstract
The Astrophysical Journal, Volume 653, Issue 1, pp. 788-791.
Astronomy and Astrophysics
Astronomy
9
Comets: General, Comets: Individual (C/2000 Wm1 [Linear]), Comets: Individual (C/2004 Q2 [Machholz]), Molecular Data
Scientific paper
Infrared emission from hydroxyl has been observed in several comets via high-resolution infrared spectroscopy. The principal excitation mechanism for this emission is single-step photolysis of H2O, terminating in OH fragments that are both vibrationally and rotationally excited. Recently reported comet data provide quantitative measures of the rotational distribution of OH*[X2Π v'=1] for J'<17.5. The measured distributions of relative g-factors for OH ``prompt'' emission, and especially the ratios of the Π(A") and Π(A') Λ-doubling components, are remarkably similar for comets C/2000 WM1 (LINEAR) and C/2004 Q2 (Machholz). We discuss how these results complement ab initio theoretical studies of water dissociation and those done in terrestrial laboratories.
Bonev Boncho P. .
Mumma Michael J.
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